HELP: "clean" delete my source code?!

From: olol (coocoo_at_citiz.net)
Date: 10/30/04 

Date: Sat, 30 Oct 2004 11:17:58 +0800

I add 4 project (BtmDrv\CIRDrv\CIR_ISR\GpioTest\)
into my PB workspace.

Before I rebuild it, I click "Build>Clean" to clean it,
but I found the output window of the build shows:

================================================
Deleted intermediate files and output files for project 'LINDA - XIZANG
Win32 (WCE ARMV4I) Debug'.
pbclean warning: D:\MyWork\Linda\BtmDrv\
    The directory is not empty.
pbclean warning: D:\MyWork\Linda\CIRDrv\
    The directory is not empty.
pbclean warning: D:\MyWork\Linda\CIR_ISR\
    The directory is not empty.
pbclean warning: D:\MyWork\Linda\GpioTest\
    The directory is not empty.
pbclean warning: D:\MyWork\Linda\Linda.ncb
    The process cannot access the file because it is being used by another
process.
pbclean warning: D:\MyWork\Linda\Linda.plg
    The process cannot access the file because it is being used by another
process.

================================================

I am shocked by these messages! Then I found that all my source codes are
deleted!

What happened?! How can I recover the source codes?

HELP, HELP!!!!